Longitudinal and transverse parton momentum distributions for pion and nucleon within relativistic constituent quark models

¹ Dep. de Física, Instituto Tecnológico de Aeronáutica, 12.228-900 São José dos Campos, São Paulo, Brazil
² Dipartimento di Física, Università degli Studi di Roma “Tor Vergata” and Istituto Nazionale di Física Nucleare, Sezio nèTor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy
³ Dipartimento di Física Nucleare e Teorica, Università deg li Studi di Pavia and Istituto Nazionale di Física Nucleare, Sezione di Pavia, Pavia, Italy
⁴ Istituto Nazionale di Física Nucleare, Sezione di Roma, P.le A. Moro 2, 00185 Roma, Italy

^a e-mail: pace@roma2.infn.it

Abstract

Longitudinal and transverse quark momentum distributions for the pion and the nucleon are calculated from quark-hadron vertexes obtained by an investigat ion of electromagnetic form factors within relativistic constituent quark models. The no-helicity flip generalized parton distributions for the pion are evaluated within three different models. The relevance for the pion of the one-gluon-exchange dominance at short range for the behavior of the form factor at large momentum transfer and of the parton distributions at the end points is shown.